138018851 has 8 divisors (see below), whose sum is σ = 142994304. Its totient is φ = 133076160.

The previous prime is 138018847. The next prime is 138018871. The reversal of 138018851 is 158810831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138018851 - 2² = 138018847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138018821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551 + ... + 16623.

It is an arithmetic number, because the mean of its divisors is an integer number (17874288).

Almost surely, 2^138018851 is an apocalyptic number.

138018851 is a deficient number, since it is larger than the sum of its proper divisors (4975453).

138018851 is a wasteful number, since it uses less digits than its factorization.

138018851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16381.

The product of its (nonzero) digits is 7680, while the sum is 35.

The square root of 138018851 is about 11748.1424489151. The cubic root of 138018851 is about 516.7884544443.

The spelling of 138018851 in words is "one hundred thirty-eight million, eighteen thousand, eight hundred fifty-one".